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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3ab9f5550fc6db8f9606d6dffea78c547ec67b9860747b5890740bd3da4acbd' 
  AND token = '6thOtwHSayjJ0waCGGzcbVvGadtwvOTK1WQF8rm3MC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}